LPCRF2AA Convert reflection coefficients to area function AA=(RF) The areas are normalised so that aa(p+2)=1: the effective area of the free air beyond the lips. aa(1) is the area of the glottis. This will be zero if rf(:,1)=1.

0001 function aa=lpcrf2aa(rf) 0002 %LPCRF2AA Convert reflection coefficients to area function AA=(RF) 0003 %The areas are normalised so that aa(p+2)=1: the effective area of the free air beyond the lips. 0004 % aa(1) is the area of the glottis. This will be zero if rf(:,1)=1. 0005 0006 0007 % Copyright (C) Mike Brookes 1997 0008 % Version: $Id: lpcrf2aa.m 713 2011-10-16 14:45:43Z dmb $ 0009 % 0010 % VOICEBOX is a MATLAB toolbox for speech processing. 0011 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0012 % 0013 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0014 % This program is free software; you can redistribute it and/or modify 0015 % it under the terms of the GNU General Public License as published by 0016 % the Free Software Foundation; either version 2 of the License, or 0017 % (at your option) any later version. 0018 % 0019 % This program is distributed in the hope that it will be useful, 0020 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0021 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0022 % GNU General Public License for more details. 0023 % 0024 % You can obtain a copy of the GNU General Public License from 0025 % http://www.gnu.org/copyleft/gpl.html or by writing to 0026 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0027 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0028 0029 aa = fliplr(cumprod([ones(1,size(rf,1)); fliplr((1-rf)./(1+rf)).']).'); 0030

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